Dtc P0301 Cylinder 1 Misfire Detected; Dtc P0302 Cylinder 2 Misfire Detected; Dtc P0303 Cylinder 3 Misfire Detected; Dtc P0304 Cylinder 4 Misfire Detected - Suzuki Ignis Service Manual

DTC P0300 RANDOM MISFIRE DETECTED (MISFIRE DETECTED AT 2 OR
MORE CYLINDERS)

DTC P0301 CYLINDER 1 MISFIRE DETECTED

DTC P0302 CYLINDER 2 MISFIRE DETECTED

DTC P0303 CYLINDER 3 MISFIRE DETECTED

DTC P0304 CYLINDER 4 MISFIRE DETECTED

WIRING DIAGRAM
1. Ignition coil No. 1
2. Ignition coil No. 2
3. CKP sensor
4. CMP sensor
5. Fuel injector
CIRCUIT DESCRIPTION
ECM monitors crankshaft revolution speed and engine speed via the crankshaft position sensor and cylinder No.
via the camshaft position sensor. Then it calculates the change in the crankshaft revolution speed and from how
many times such change occurred in every 200 or 1000 engine revolutions, it detects occurrence of misfire.
When ECM detects a misfire (misfire rate per 200 revolutions) which can cause overheat and damage to the
three way catalytic converter, it makes the malfunction indicator lamp (MIL) flash as long as misfire occurs at
that rate.
After that, however, when the misfire rate drops, MIL remains ON until it has been judged as normal 3 times
under the same driving conditions.
Also, when ECM detects a misfire (misfire rate per 1000 revolutions) which will not cause damage to three way
catalytic converter but can cause exhaust emission to be deteriorated, it makes MIL light according to the 2 driv-
ing cycle detection logic.
2
+B
IG1
BLK/RED
3
4
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-81
1
C42-20
GRN/YEL
IG1
BLK/WHT
GRN/WHT C42-19
C42-9
BLU/YEL
5
BLU/WHT C42-21
BLU/RED C42-31
5
BLU/ORN C42-8
C42-23
YEL/BLK
C42-11
RED/YEL
ECM
5V
5V
5V
5V